Snuck in a film portrait during a session

Nice, though I'd frame her head on the right third.
Or flip the image horizontally.
My eye reads it from left to right, so in your framing I set from the head and are lead to nothing.
Anyway, that's me and maybe others read it the exact opposite way.

As for the ⅓-⅔ overexposure, if you account your lens' true t-stop, the shutter'a and the lightmeter's accuracy, it's as small as a normal statistical error.